public async Task ScheduleAsyncTask_SkipsPendingTasks()
{
using (var scheduler = new TaskDelayScheduler(TimeSpan.FromMilliseconds(250), IProjectThreadingServiceFactory.Create(), CancellationToken.None))
{
var tasksRun = new bool[3];
var task1 = scheduler.ScheduleAsyncTask(ct =>
{
tasksRun[0] = true;
return(Task.CompletedTask);
});
var task2 = scheduler.ScheduleAsyncTask(ct =>
{
tasksRun[1] = true;
return(Task.CompletedTask);
});
var task3 = scheduler.ScheduleAsyncTask(ct =>
{
tasksRun[2] = true;
return(Task.CompletedTask);
});
await task1;
await task2;
await task3;
Assert.False(tasksRun[0]);
Assert.False(tasksRun[1]);
Assert.True(tasksRun[2]);
}
}
public void CancelPendingUpdates_PendingTasksAreCanceled()
{
var scheduler = new TaskDelayScheduler(TimeSpan.FromMilliseconds(50), new IProjectThreadingServiceMock(), CancellationToken.None);
bool taskRan = false;
var task1 = scheduler.ScheduleAsyncTask((ct) =>
{
taskRan = true;
int count = 50;
while (count != 0)
{
ct.ThrowIfCancellationRequested();
Thread.Sleep(20);
--count;
}
return(Task.CompletedTask);
});
scheduler.CancelPendingUpdates();
try
{
task1.Task.Wait();
Assert.False(taskRan);
}
catch (OperationCanceledException)
{
}
}
public void ScheduleAsyncTask_CancelsExistingTasks()
{
var scheduler = new TaskDelayScheduler(TimeSpan.FromMilliseconds(50), new IProjectThreadingServiceMock(), CancellationToken.None);
var tasksRun = new bool[3];
var task1 = scheduler.ScheduleAsyncTask((ct) =>
{
tasksRun[0] = true;
return(Task.CompletedTask);
});
var task2 = scheduler.ScheduleAsyncTask((ct) =>
{
tasksRun[1] = true;
return(Task.CompletedTask);
});
var task3 = scheduler.ScheduleAsyncTask((ct) =>
{
tasksRun[2] = true;
return(Task.CompletedTask);
});
task1.Task.Wait();
task2.Task.Wait();
task3.Task.Wait();
Assert.False(tasksRun[0]);
Assert.False(tasksRun[1]);
Assert.True(tasksRun[2]);
}
public void Dispose_ClearsPendingTasks()
{
var scheduler = new TaskDelayScheduler(TimeSpan.FromMilliseconds(50), new IProjectThreadingServiceMock(), CancellationToken.None);
bool taskRan = false;
var task1 = scheduler.ScheduleAsyncTask((ct) =>
{
taskRan = true;
int count = 50;
while (count != 0)
{
ct.ThrowIfCancellationRequested();
Thread.Sleep(20);
--count;
}
return(Task.CompletedTask);
});
scheduler.Dispose();
// There are two cases to consider in the verification. One, the cancellation is detected by the scheduler. In that case
// the task will complete successfully (it does not cancel itself), but the inner async task will not run. And 2, the cancellation
// occurs after the scheduling starts. In that case the inner task will execute, but is crafted to throw and OperationCancelledException.
try
{
task1.Task.Wait();
Assert.False(taskRan);
}
catch (OperationCanceledException)
{
}
}
public async Task ScheduleAsyncTask_RunsAsyncMethod()
{
using var scheduler = new TaskDelayScheduler(TimeSpan.FromMilliseconds(10), IProjectThreadingServiceFactory.Create(), CancellationToken.None);
bool taskRan = false;
var task = scheduler.ScheduleAsyncTask(ct =>
{
taskRan = true;
return(Task.CompletedTask);
});
await task;
Assert.True(taskRan);
}
public void ScheduleAsyncTask_RunsAsyncMethod()
{
var scheduler = new TaskDelayScheduler(TimeSpan.FromMilliseconds(10), new IProjectThreadingServiceMock(), CancellationToken.None);
bool taskRan = false;
var task = scheduler.ScheduleAsyncTask((ct) =>
{
taskRan = true;
return(Task.CompletedTask);
});
task.Task.Wait();
Assert.True(taskRan);
}
public async Task Dispose_SkipsPendingTasks()
{
using var scheduler = new TaskDelayScheduler(TimeSpan.FromMilliseconds(250), IProjectThreadingServiceFactory.Create(), CancellationToken.None);
bool taskRan = false;
var task = scheduler.ScheduleAsyncTask(ct =>
{
taskRan = true;
return Task.CompletedTask;
});
scheduler.Dispose();
await task;
Assert.False(taskRan);
}
public async Task ScheduleAsyncTask_Noop_OriginalSourceTokenCancelled()
{
var cts = new CancellationTokenSource();
using var scheduler = new TaskDelayScheduler(TimeSpan.FromMilliseconds(250), IProjectThreadingServiceFactory.Create(), cts.Token);
cts.Cancel();
bool taskRan = false;
var task = scheduler.ScheduleAsyncTask(ct =>
{
taskRan = true;
return Task.CompletedTask;
});
await task;
Assert.False(taskRan);
}
public async Task CancelPendingUpdates_SkipsPendingTasks()
{
var scheduler = new TaskDelayScheduler(TimeSpan.FromMilliseconds(250), new IProjectThreadingServiceMock(), CancellationToken.None);
bool taskRan = false;
var task = scheduler.ScheduleAsyncTask(ct =>
{
taskRan = true;
return(Task.CompletedTask);
});
scheduler.CancelPendingUpdates();
await task;
Assert.False(taskRan);
}
public async Task RunAsyncTask_SkipsPendingTasks()
{
using (var scheduler = new TaskDelayScheduler(TimeSpan.FromMilliseconds(250), IProjectThreadingServiceFactory.Create(), CancellationToken.None))
{
bool taskRan = false;
var task = scheduler.ScheduleAsyncTask(ct =>
{
taskRan = true;
return(Task.CompletedTask);
});
bool immediateTaskRan = false;
var task2 = scheduler.RunAsyncTask(ct =>
{
immediateTaskRan = true;
return(Task.CompletedTask);
});
await task;
await task2;
Assert.False(taskRan);
Assert.True(immediateTaskRan);
}
}